Meteorites that contain bits of rock called calcium -aluminium-rich inclusions suggest that the solar system may have formed very quickly from the ashes of other stars.
That’s because the inclusions formed with the radioactive isotope aluminium-26, which is forged inside stars tens of times as massive as the sun and decays with a halflife of only 720,000 years.
But, a team, led by Vincent Tatischeff of the National Center for Scientific Research in France, claim that a massive star cluster would have been have been so hot that most of the Al-26 would have decayed before planets could congeal. Instead, the scientists say that the solar system sprang from a solitary star’s ashes, which could have cooled more quickly, the ‘New Scientist’ reported.
And, to account for the amount of Al-26 observed in meteorites, the star would still have had to be massive, meaning it probably formed in a clutch of other stars, say the planetary scientist.